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A platform for research: civil engineering, architecture and urbanism
Quantitative petrographic analysis of aggregate
Abstract Petrographic properties of an aggregate particle determine to a large extent how it will behave in service—its resistance to frost, wear and impact. An estimate of alkali reactivity and skid resistance can also be made. Several provinces in Canada use a variance of “Petrographic Number” determination, which gives a quantitative assessment of the quality of the aggregate. Each petrographic type is assigned a multiplier. The higher the multiplier, the worse is the aggregate quality. To-date, a fairly rigid system of multipliers of 1, 3, 6 and 10 have been used to indicate good, fair, poor, and bad quality respectively. Over one hundred samples representing various petrographic types were tested in the laboratory to determine their absorption, adsorption, freeze-thaw resistance, abrasion resistance, hardness, grain size, and specific gravity. Five experienced petrographers from the Ontario Ministry of Transportation and Communications assigned the currently used petrographic multiplier to each of the samples. Stepwise regression analysis was used to determine the relationship between the petrographic multipliers and the physical tests. The empirical equation so obtained was then used to calculate the “new petrographic number for each rock type. The results indicate that some of the currently used petrographic multipliers do not correctly reflect the quality of the rock, and should be changed. A much more reliable estimate of aggregate quality can be obtained by applying the new numbers in established methods of quantitative petrographic number determination.
Quantitative petrographic analysis of aggregate
Abstract Petrographic properties of an aggregate particle determine to a large extent how it will behave in service—its resistance to frost, wear and impact. An estimate of alkali reactivity and skid resistance can also be made. Several provinces in Canada use a variance of “Petrographic Number” determination, which gives a quantitative assessment of the quality of the aggregate. Each petrographic type is assigned a multiplier. The higher the multiplier, the worse is the aggregate quality. To-date, a fairly rigid system of multipliers of 1, 3, 6 and 10 have been used to indicate good, fair, poor, and bad quality respectively. Over one hundred samples representing various petrographic types were tested in the laboratory to determine their absorption, adsorption, freeze-thaw resistance, abrasion resistance, hardness, grain size, and specific gravity. Five experienced petrographers from the Ontario Ministry of Transportation and Communications assigned the currently used petrographic multiplier to each of the samples. Stepwise regression analysis was used to determine the relationship between the petrographic multipliers and the physical tests. The empirical equation so obtained was then used to calculate the “new petrographic number for each rock type. The results indicate that some of the currently used petrographic multipliers do not correctly reflect the quality of the rock, and should be changed. A much more reliable estimate of aggregate quality can be obtained by applying the new numbers in established methods of quantitative petrographic number determination.
Quantitative petrographic analysis of aggregate
Peter P., Hudec (author)
1984
Article (Journal)
Electronic Resource
English
BKL:
56.00$jBauwesen: Allgemeines
/
38.58
Geomechanik
/
38.58$jGeomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
56.00
Bauwesen: Allgemeines
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB18
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